Means for creating perforated concrete casing

Abstract

The means for creating perforated concrete casing comprises a hollow cylindrical canister having a plurality of spaced apart rows of elongated openings formed therein. The elongated openings in each row are horizontally disposed and are vertically spaced. A first support means is secured to the outside surface of the canister adjacent each row of openings. A plurality of vertically spaced plates are mounted on each of the first support means and are selectively movable into and out of the openings of the associated row. A second support means extends upwardly through the canister and has a plurality of vertically spaced wedges mounted thereon. The second support means is movable towards the canister so that the wedges will penetrate the stiff concrete positioned adjacent the inside surface of the canister so as to create tapered perforations therein. Means is provided for rotating the canister so that the wedges may successively communicate with the row of perforations created by the plates on the first support means. The method comprises the steps of: (1) extending the plates on all of the first support means into the elongated openings formed in the canister; (2) depositing a layer of stiff concrete adjacent the inside surface of the canister so that the plates are imbedded therein; (3) removing the plates from the stiff concrete thereby creating rows of perforations in the concrete; (4) extending a row of vertically spaced apart wedges through the stiff concrete from the inside surface thereof so that the wedges communicate with the perforations so as to enlarge the same and to alter the shape thereof; (5) removing the wedges from the perforations; (6) repeating the wedging process until all of the perforations have been enlarged and altered; and (7) removing the canister from the stiff concrete.

I claim: 
     
       1. A device for forming perforated concrete casings a turntable means,   a cylindrical canister having upper and lower ends, inside and outside surfaces, said canister being removably mounted on said turntable means,   means for placing a layer of stiff concrete adjacent the inside surface of said canister,   said canister having a plurality of spaced-apart rows of elongated openings formed therein, the elongated openings in each row being horizontally disposed and vertically spaced, said rows extending completely around said canister,   a first support secured to the outside surface of said canister adjacent each row of openings,   a plurality of vertically spaced plates mounted on each of said first supports and being selectively movable into and out of the openings of the associated row of openings so that perforations may be created in the concrete to form a perforated concrete casing having perforations formed therein completely therearound, a movable second support extending into the center area of said canister, a plurality of vertically spaced apart wedge members mounted on said second support, and means for moving said second support towards said canister to cause said wedge members to penetrate the concrete to create perforations therein, said wedge members extending into the perforations created in the concrete by the plates on the said first supports.   
     
     
       2. The device of claim 1 wherein a stripping plate is mounted on said second support and has a plurality of vertically spaced openings formed therein for movably receiving said wedge members therein, said stripping plate being substantially vertically disposed and having an outer end portion adapted to yieldably engage the inside surface of concrete adjacent the inside surface of said canister. 
     
     
       3. The device of claim 1 wherein each of said wedge members have inner and outer ends and are horizontally disposed, the outer ends of said wedge members having a vertical thickness less than the vertical thickness of the inner ends thereof. 
     
     
       4. The device of claim 3 wherein the inner ends of said wedge members have horizontal widths greater than the horizontal width of the outer ends thereof. 
     
     
       5. A device for forming perforated concrete casings, a turntable means,   a cylindrical canister having upper and lower ends, inside and outside surfaces, said canister being removably mounted on said turntable means,   means for placing a layer of stiff concrete adjacent the inside surface of said canister,   said canister having a plurality of spaced-apart rows of elongated openings formed therein, the elongated openings in each row being horizontally disposed and vertically spaced, said rows extending completely around said canister,   a first support secured to the outside surface of said canister adjacent each row of openings,   and a plurality of vertically spaced plates mounted on each of said first supports and being selectively movable into and out of the openings of the associated row of openings so that perforations may be created in the concrete to form a perforated concrete casing having perforations formed therein completely therearound.   a movable second support extending through the center area of said canister,   a plurality of vertically spaced-apart wedge members mounted on said second support, and means for moving said second support towards said canister to cause said wedge members to penetrate the concrete to create perforations therein, said wedge members extending into the perforations created in the concrete by the plates on the said first supports,   said second support extending upwardly through said turntable means.   
     
     
       6. The device of claim 5 wherein an indexing means is mounted on said turntable means for positioning said turntable means relative to said canister so that said wedge members will be aligned with a row of elongated openings. 
     
     
       7. In combination, a rotatable turntable,   means for rotating said turntable,   a cylindrical canister having upper and lower ends and removably supported on said turntable, said canister adapted to have a layer of stiff concrete positioned adjacent the inner surface thereof,   said canister having a plurality of spaced-apart rows of elongated openings formed therein, the elongated openings in each row being horizontally disposed and vertically spaced,   a plurality of first supports (means) secured to the outside surface of said canister, one of said first supports being positioned adjacent each row of openings,   a plurality of vertically spaced-apart plates mounted on each of said first supports and being selectively movable into and out of the openings of the associated row of openings,   a movable second support extending upwardly through said turntable and said canister, said second support having a plurality of horizontally disposed and vertically spaced-apart wedge members thereon,   means for moving said second support towards said canister to cause said wedge members to penetrate the layer of concrete adjacent the inner surface of said canister to create perforations therein, said wedge members extending into the perforations created in the casing by the plates on the first supports.